2015 LEXUS RX450h warning lights

2822-4. Using other driving systems
■
Situations in which the pre-collision system does not function properly
The system may not function effectively in situations such as the following: ●
On roads with sharp be nds or uneven surfaces●
If a vehicle suddenly moves in front of your vehicle, such as at an intersection●
If a vehicle suddenly cuts in front of your vehicle, such as when overtaking●
In inclement weather such as heav y rain, fog, snow or sand storms●
When your vehicle is skiddi ng with the VSC system off●
When an extreme change in vehicle height occurs●
When the axis of the radar is out of adjustment■
Automatic cancelation of the pre-collision system
When a malfunction occurs due to sensor contamination, etc. that results in the
sensors being unable to detect obstacles, the pre-collision system will be automati-
cally disabled. In this case, the system will not activate even if there is a collision pos-
sibility.■
When there is a malfunction in the system, or if the system is temporarily unus-
able
Warning lights and/or warning messages will turn on or flash. (  P. 7 3 3 , 74 3 )

7014-3. Do-it-yourself maintenance
4
Maintenance and care 7
ECU-IG1 NO. 1 10 A Multiplex communication system,
steering sensor, shift lock control sys-
tem, tilt and telescopic steering,
power back door, pre-collision sys-
tem, vehicle dynamics integrated
management, tire pressure warning
system8
S/ROOF 30 A Moon roof9
FUEL OPN 7. 5 A Fuel filler door opener10
PSB 30 A Pre-collision seat belt11
TI & TE 30 A Tilt and telescopic steering system12
DR LOCK 10 A13
FR FOG 7. 5 A Front fog lights14
P-S E AT L H 30 A Po w e r s e a t ( l e f t - s i d e )15
4WD 7. 5 A AW D s y s t e m16
INVERTER 20 A Po w e r o u t l e t17
RR FOG 7. 5 A18
D/L ALT B 25 A Multiplex communication system,
power door lock system, power back
door19
EPS 10 A Electric power steering system20
ECU-IG1 NO. 2 10 A Intuitive parking assist, pre-collision
seat belt, capacitor
21
PA N E L 10 A Switch illumination, navigation system,
hybrid transmission system, audio sys-
tem, multi-information display, air con-
ditioning system, multiplex
communication systemFuse Ampere Circuit

5
When trouble arises
7335-2. Steps to take in an emergency
If a warning light turns on or a warning buzzer sounds...Stop the vehicle immediately. Continuing to drive the vehicle may be dangerous.
The following warning in dicates a possible problem in the brake system.
Immediately stop the vehi cle in a safe place and contact your Lexus
dealer.
* : Parking brake engaged warning buzzer
 P. 74 8
Stop the vehicle immediately.
The following warning indicates the po ssibility of damage to the vehicle
that may lead to an ac cident. Immediately stop the vehicle in a safe place
and contact your Lexus dealer. Warning light Warning light/Details
(U.S.A.)

(Canada) Brake system warning light (warning buzzer)
*•Low brake fluid
• Malfunction in the brake system
This light also comes on when the parking brake is not
released. If the light turns off after the parking brake is fully
released the system is operating normally.
Warning light Warning light/Details
Charging system warning light
Indicates a malfunction in the vehicle’s charging systemCalmly perform the following actions if any of the warning lights comes on
or flashes. If a light comes on or flashes, but then goes off, this does not nec-
essarily indicate a malfunction in the system.

5
When trouble arises
7435-2. Steps to take in an emergency
If a warning message is displayed
Stop the vehicle immediately. Continuing to drive the vehicle may be dangerous.
The following warning in dicates a possible problem in the brake system.
Immediately stop the vehi cle in a safe place and contact your Lexus
dealer.
Wa r n i n g m e s s a g e Details
(U.S.A.)

(Canada) Indicates the following:
• The brake fluid level is low; or,
• The brake system is malfunctioning.
A buzzer also sounds.
Indicates a malfunction in:
• The regenerative brake system; or,
• The electronically controlled brake system
A buzzer also sounds.If a warning is shown on the multi-information display, stay calm and per-
form the following actions:
Master warning light The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the
multi-information display.
Multi-information display
If any of the warning lights comes on again after the following actions
have been performed, contact your Lexus dealer.

5
When trouble arises
7455-2. Steps to take in an emergency
Have the vehicle inspected by your Lexus dealer immediately.
A buzzer sounds and a warning message is shown on th e multi-informa-
tion display. Failure to investigate the cause of the fo llowing warnings may
lead to the system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Lexus dealer immediately. Wa r n i n g m e s s a g e Details
(AWD models) Indicates a malfunction in the AWD system
Indicates a malfunction in the steering lock system
(Flashes)
(If equipped) Indicates a malfunction in the LED headlight system
Indicates a malfunction in the brake lights system

863Alphabetical index
Daytime running light system............ 219
Defogger*
Rear window........................................358
Side mirrors..........................................358
Dimensions ............................................. 798
Dinghy towing ........................................324
Display
Energy flow ............................................. 39
Multi-information display............... 206
Trip information .................................. 209
Warning message .............................743
Do-it-yourself maintenance............. 648
Door courtesy lights
Door courtesy lights ........................ 582
Wattage ................................................ 809
Door lock
Back door .................................................75
Side door ................................................... 72
Wireless remote control................... 69
Door pockets ......................................... 587
Doors
Back door .................................................75
Door lock ................................ 56, 69, 72
Door windows ........................................ 112
Power back door ..................................75
Side door ................................................... 72
Side mirrors............................................109
Driver's seat belt reminder light .....736
Driving
Break-in tips ........................................... 167
Correct posture ...................................130
Procedures .............................................166
Utility vehicle
precautions ........................................292
Winter driving tips ............................ 302 Driving position memory ...................... 93
Electric power steering ........................271
Electronic features control ...............206
Electronic key
If the electronic key does not
operate properly ............................. 781
Emergency flashers
Switch....................................................... 724
Emergency, in case of
If a warning buzzer sounds........... 733
If a warning light turns on............... 733
If a warning message is
displayed............................................. 743
If the back door opener is
inoperative ............................................ 79
If the electronic key does not
operate properly ............................. 781
If the hybrid system will
not start ................................................ 777
If the shift lever cannot be
shifted from P ................................... 779
If the vehicle has a discharged
12-volt battery...................................784
If you have a flat tire ......................... 764
If you lose your keys ........................ 780
If you think something is
wrong ................................................... 732
If your vehicle becomes stuck ..... 793
If your vehicle has to be
stopped in an emergency ..........795
If your vehicle needs to be
towed.................................................... 725
If your vehicle overheats ............... 788D
E
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.

868Alphabetical index
Parking assist sensors* .......................248
Parking brake .......................................... 195
Parking lights
Replacing light bulbs........................708
Switch ........................................................ 217
PCS
Function .................................................. 278
Pre-collision braking off
switch ................................................... 279
Warning light ....................................... 734
Personal lights
Switch ......................................................583
Phone*........................................... 429, 552
Power back door ..................................... 75
Power control unit coolant
Capacity ................................................ 804
Checking ...............................................659
Preparing and checking
before winter .................................... 302
Power easy access system................... 95
Power outlet............................................. 601
“POWER” switch.................................... 177
Power windows ........................................ 112
Pre-collision system
Function .................................................. 278
Pre-collision braking off
switch ................................................... 279
Warning light ....................................... 734 Radar cruise control............................ 236
Radiator ......................................................661
Radio* ............................................ 365, 477
Rear seat entert ainment system*
Rear seats
Folding down ......................................... 89
Seat adjustment..................................... 89
Rear turn signal lights
Replacing light bulbs ....................... 708
Wattage .................................................809
Rear view mirror
Compass ................................................622
Inside rear view mirror ..................... 107
Outside rear view mirrors ..............109
Rear view monitor
system* ...................................... 258, 266
Rear window defogger* ....................358
Rear window wiper.............................. 229
Remote Touch*
Replacing
Electronic key battery ..................... 687
Fuses ........................................................ 689
Light bulbs ............................................ 708
Tires...........................................................764
Wireless remote control
battery ................................................. 687
Reporting safety defects for
U.S. owners..........................................840
Reset the maintenance data ..............641
Roof luggage carrier........................... 296P R

871Alphabetical index
Tachometer .............................................. 197
Tail lights
Replacing light bulbs ....................... 708
Switch ........................................................ 217
Wattage ................................................ 809
Talk switch*.................................. 429, 553
Telephone* .................................. 429, 552
Telephone switch* .................... 429, 553
Theft deterrent system
Alarm ......................................................... 126
Immobilizer system ............................ 124
Theft prevention labels ........................ 129
Tire inflation pressure..........................679
Tire information
Glossary ..................................................819
Size ............................................................ 815
Tire identification number .............. 815
Uniform tire quality grading........... 817
Tires
Chains ..................................................... 302
Checking ............................................... 670
If you have a flat tire.......................... 764
Inflation pressure ............................... 679
Inflation pressure sensor.................. 671
Information..............................................813
Replacing............................................... 764
Rotating tires ........................................ 670
Size ........................................................... 807
Snow tires.............................................. 302
Spare tire ............................................... 764
Tire pressure warning
system...................................... 670, 736 Tools ........................................................... 764
Total load capacity ................................ 301
Towing
Dinghy towing ..................................... 324
Emergency towing............................ 725
Trailer towing ...................................... 306
TRAC...........................................................271
Traction control .......................................271
Trailer towing ............................. 306, 323
Trip information display......................206
Trip meter ..................................................197
Turn signal lights
Replacing light bulbs ....................... 708
Switch........................................................ 193
Wattage ................................................. 809T
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.